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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1f58fcf7f7b6d7e03f65c6c5f21eaafe07302e41563cbf5244caa1ac7c90b5' 
  AND token = 'n+vP3IGjtXG7jRw1ehj4AgPTPq3qo0Zwyk0RJpypuRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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