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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1173761fe43a865c9a5d1eb85e707673dae9dfb61e617b4930d8806ff66f6e24' 
  AND token = 'X2ocQ7T0l99di7CsWfUYXiqsYnRCo9bqR7jjc+y8kcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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