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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95925ebe4ea4f52b2e9c78ec71d2e46817f08ecd12af96365863862d612e593f' 
  AND token = 'yN1guUzQlL1eoZ6KgHgrgvDz+aMi5mp7jXQEdXL0wMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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