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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859a8a650b58924068260ce18e7a95603362f6242d64a25c4b1694b2022ae913' 
  AND token = '+YOMRfQR/yE9/YnbVitp9E6u7CpGPutM/7PgprVj0+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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