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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98562baa95b4f11d941673f5f119daa0edaf8b4d9d196f0ba469a53e9753a4bf' 
  AND token = '2NalWvosAvA9PNmNOyId6wDis3LD8fRuNL7APRf7M9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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