SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6559aa880c08fc286310fe8914cfb42b169ae623eb5ff14d348c4627f929b5e' 
  AND token = 'AYWgpIlVLiogopzcwJG6g+3/HbhvAm+O+pUWwzEnCB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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