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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac7132e2a0793ce06b7b791f7c566c6669ab844119bf0de962d3e8d880a1bf0' 
  AND token = 'a4Ze3bTDmZLuemrzQiRXIBnBFYykfrpmCdZsv7dRq6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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