SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498ed2c16337562d2b5a89d398cb17ff4d70f58f344c72b0944c4e06aed844fb' 
  AND token = 'OoZCDK+EA4lDJaDloZUUjURntVYesnPDG2X9gmqFDc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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