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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb652de7766a532cf77cae52389c3424988ec4b3935a14e7dac29cc3620981ab' 
  AND token = '9IhRRhfirnjBGVX2pU0/84QfSUUte/8T7K593J7q0RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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