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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ff5625b55f5c85e32519e569d224eca604384942292999b4c3ed3dc305e681' 
  AND token = '11r1yuw1+Kl29PFVhqdpoMKmw2YzFs5otwKHGDduARw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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