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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd3fe9a0d5d8670702b98d7e8a351f0968550877979a29bff94b4ad0733f650' 
  AND token = 'tWCfTEcLNyDqW3yHHE/UzYi7Zc+ZdS5jDHLXFe2cmrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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