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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d4bd5044fa8387870b92001a60f9b3c90446ecfae6274b5369ccaa5ce29fe0' 
  AND token = 'zLzYyutz3OpCRd1Mvi4MunpHl6vVw8WRJPoUDTzsRBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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