SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43f3ca562b1a90730fa87ad22c7b966a6c5845c0a47bf7317aedba1d22373fd' 
  AND token = 'G09phD/jn+He4CXqhL4nYDDv0AK9z87xUJuBlU0yoeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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