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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce98e5651a778f02bebfc4074e58b939bf11dd816c736e36db636b266b6d50fe' 
  AND token = '9dGh96XmUlG7p1HqWa2Kw1NBuN485F88CI6hGox82ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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