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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6506eec7db01a8b3bd658b1e960343fc8db4c23947b5e1ced125039108055f' 
  AND token = 'FbwUlYc+f+DzLXxd36btcYiXt96f7M13b1fkY9umYuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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