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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2964995c3cfb422206e4dfe1eedb6db1eb63b7fd56ec84c7bf0e9208f50a5018' 
  AND token = 'OONfAGhQ5BeTUf+OTTKQh6QsGa9+nad3p/PrJNdxwz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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