SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae09dfa785957ca65a9d38cb3c2191b77d7371bd82bfcfe724e89db2808f6809' 
  AND token = 'wjDYvOb+rIVJATnTnBx6/FpncxZrx16WD/9wmrIGvdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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