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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814d5b8fa73ee01a4a621df4dd0ef863f4fcfee811ea54052054e492568a34ee' 
  AND token = 'Aub8bEtijTcEk9RpXHUQMwRP9P5KOfTMZTQIojjFjnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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