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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dd5e2d477e2c07e2cb8f105bac205a9c51924dd5744d64eb7dbbcf938aeb35' 
  AND token = 'FpL+ArUT57qpIwpvoabaBNmZUpDHN7r/1X9L4xDxCgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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