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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b088b848edd06af52c84c98fcc1ac7a4832ed2ab04e173d357a74720096cb0e3' 
  AND token = 'J5HdzgV1LfQ9JuW8JgotzXLntVDLeKhBp15oG73LaY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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