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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28054aff74dcd9868bf46619d879af04578eedbb311b533e92b9f54e81761fcc' 
  AND token = 'Ie5XOAKmw5kRRsTCVzas/B3uTQkPTqX8YaGdpW1xd9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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