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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d67a8edb76d5c9b2cc53cedca3d28155f1e41e87c9bd3693570774065c9b6de' 
  AND token = '3sSNa1BMwH1dJ9sfxNTEFFf3/WKAjL9uQkY4nr8Hub4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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