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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df62ba45ed2e49529e863581b7a24b6da65c9d6b7cb1f2cf9e95afd2a9e2ae4' 
  AND token = '5bbJndEIMlswgq7cwdME/3Ei3Ty1uFNQ4emW0EHM7qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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