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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e3b05a4985ba5adb3cec0ac9c266dd0a9d33b17c80f1da0bfde6899d560acb' 
  AND token = 'XlnY9LtCwBbjOM2i47YHdyzalo1YOkjKA+coOrGFfFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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