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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89984eeef2656e7861df7c9060b2a66355f4c5184951ba01e0b83d399305e216' 
  AND token = 'IeMaCy2KbzT0bZ6m3oVqncPwpBjSewHZO7jmd8tjTj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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