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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f91a5956fd3617b557e4e81e11c489b04c70972fb46516191448840a02f3d7' 
  AND token = 'c60Qlne94EmKoxKx9LSy13qqcFentOj7WeFKYp+i30A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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