SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d44b99c4b320fb722ba53ad1bf6166ddf596d89f548c711014249fd73733218' 
  AND token = 'YjJYgSqejHAUqf3JPmdjoz9jj+LnppLiuC/glSrIn3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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