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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b115365736af95c84ede2032ad380da134ebd3fdc6d2ab9ac3a5cbc0f80b3e' 
  AND token = '6KRch4FHf9mXxBb/rPwOtJ+XuPPZbik16MzTGmYKoNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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