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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a61c6ac8200e9eb918b3d0414df2eba67f6c17015856924a03cfea6e7ac03e' 
  AND token = 'ePwiHnJliAfcJgOu9oV4eEvgG7lOvBOE6kyklDE6PII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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