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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0713e2407beace60c5c792ac1f529b205401b0744a8fedcad3689d8e83a41d' 
  AND token = 'dwy30uHYaIEXvL8AsH9d5nkaK1J8Qs/hgWfwE6571r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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