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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8338808af83953e6644ac4ba2eabd80863d1a85f05c977b9104597c9b4ddce' 
  AND token = 'lSQSKeJytzsjNYsiv7l2FjkjGhW34/eWNN3jEivN5NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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