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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee0a364218a8230882f325d990d5f57710973337d520240866b764b65edfe7b' 
  AND token = '5QSa9u/4axw7RpPGFvagoSwEdvL9dGIvro2eVmzWuCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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