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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdde8c3c98b0afeb3f7f80159df5dad36d7b67dc2ed35318007c8b271c4bf532' 
  AND token = 'OfQBNdzayh3g1NbkVZ8XTwDmgunVj6tO48PH4bir0PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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