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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00795b7693c3218dae7ed87bc5f77b002aa15f4cda15d358502388e5ac4918ca' 
  AND token = 'LW1gxIfgMBUQJ75PeBZntq4HwoDtw7jniDmiQkyaCWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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