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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99bc5bed3e3fb1ebefcd883a9c7a4bc14d75fae3a48222671bdfafd33754294' 
  AND token = 'dWDle0k0zvLxUgCZDdBM7B9O8m37yGRiL4N8FSQz+Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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