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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e190e1991b35a09023d242c13d91bfc96373cb2d7b2c7df511c31c013bb819bb' 
  AND token = 'SFWx74XOYXIGMvxsPQayclMnvt7EqTVMdNQ/mgt/a+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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