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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ec3f1052b0a2333d41368ee107a48c684445361e2cb95083ebf0b59138dcb5' 
  AND token = 'Iem/js+xVnITdMfXJUawNM0ylHiAcPpoDbeJKDaul6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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