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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ea76778ff033a8d1709c587a5dca8c7afdfd08f8e4b8f22473abc96594a312' 
  AND token = 'IXJHxQJ7BnP2vbFU4qf6GJSj2J39e2Slgm1N92UHQIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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