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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399d8443eb41fb083163414484e867bb216dfb787985298f1ff9c20e978bef17' 
  AND token = 'DhCsGB5N72xqn25fbi30/cOmgVIwM94A5Qyz2lxPmd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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