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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf3cee4ef55ddb0d2e1cfae1ae849b60b4fc553a90e09f0a988c450731ec5dd' 
  AND token = 'yXjYPuqILtnRflZ57QSVjEakeS6lB7i7jMGoIAwrPjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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