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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f14ecf1eda65780f2e9cbc2227c224028ba93d75e977a22a93f19db0dac576' 
  AND token = 'hbBtNhV4rAMyNw/WOzUt5Ouc04iZiVUyojcF3OvNw/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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