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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf1c421f4b85fa0ad89e1544bf831640e066371aa3c319385caf88d31af509b' 
  AND token = 'oXWzuTGr7HGZ+C6HVdW+E8xkHxYjMhW/y1NLY+LU0Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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