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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35790c5ab718b1dda09f115b66dd555a61a3876a8c7779d5f7800257ddd03e4' 
  AND token = 'YNLpBEivsrdiCpxhX0wx9ujuqhIV30N4g+e21g2bA6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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