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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679c918786c670fb3b47aa2d80fbb2acd9bb7d9c7eae9de67803eb89a7fe675f' 
  AND token = 'ypB9t9tqpHqaOVzxvSqQrSe6cCixB1k8h2vN1Nhdms8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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