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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ef4e0574a071547a845d9ed5b63219c25e238493de01867e8aea6750920ae0' 
  AND token = 'xAeD2aUy5wCXpvjO2SJeYNeYV21kqDyAEK007e0NAPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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