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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b918ec13df63722b040c733d93c169ab38e79f33796c983cb2c0b1f42b31dd4' 
  AND token = '8e8+QFaATTPqpw2jamM03R2Dffnf9U6aYazb0vLY37w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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