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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee3beb54ce4810259e3778a7bb3ebba3529485ca24ac23d259db0781869cbd9' 
  AND token = 'j9pfsdsCFylxh6rONH1CqAQncserzlqrf8aYgLu5MP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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