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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed14459d08a6d28cd14e702a15b4c3a839734a3e3130db5a7eef5da5a06f309' 
  AND token = 'BFp8VRd8U/AmLmtfrk1xq8zgx0ia1Y2a6eeI1Mt0cUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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