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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616870ae7e61f8437102331548b4c13089f08665a310d9a32174a377c3a19682' 
  AND token = 'C97623G48Ybo26/UONdYsbzpKXqXlHiilR7LT+Hw0fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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