SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952b83ab88b3e9033e751558fdfa9072c580ea9ed41122f13f08490ddf28bc7a' 
  AND token = '08pVlQxb3wbZYcBgWirJ++ZqSGaFw6IJWVYRW62fjWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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