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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f6d1e94921a09744b2e7ef9a431e509d9c67d910793988101515337beb5574' 
  AND token = 'Y5ZWFdr6rFAvt0z/QsR4MpMfw2/QeEV8AKgYbO/z2n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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