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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d7beb9551996dd7e1661842d28f61e6d76f6db0bec4c8acab4b6093553cb0d' 
  AND token = '+AGFN9rU/wHIgpaf/vazkDMk0JZT06Ma6/IAcdaa890=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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