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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ffedaef1b2297862fbf4dbf9ef617cef95cbb994688fdb22c40dc095d4014c' 
  AND token = '17VfhOny27sfwKe5eMzEiYHX51XHgCxZrwc2dGq8TD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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