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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e75e942d9cabe3160728f91e87bbf9fb4874ef0f10de520bad247a7848dc124' 
  AND token = 'tw8I0YzHQjXOjrPF43iQbBGcrAW+fkm7bWg2MTU5AQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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