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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd557a7f2e6ef1ab45900de00f27ebfe349b4ca59840f93387c9a2e43e1e2ddd8' 
  AND token = '9J0az5VLENu+hvVcfOeM3COgRaxw3W94CO3tqzgypmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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