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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bbcd6c96d59c761e09e510f3091b5a564f7eb192b15f33e10c3030a39d461d' 
  AND token = 'fJXLFALUxzrbSgTkntswtZmjBYNYLxyq1lKOXzWQ0IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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