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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c87517cc7c33d62b850f9a6afba5b159fcbd2d1ad855493cb098d05b4f87c6' 
  AND token = 'BqP8HDRxfHiDTQJPab5CrHfsFo1EeHQa1P7nnJqOud4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}