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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448549560e342b57aefa4c0de699d935b8d025c7a07f59383fb053b3dfe460e0' 
  AND token = 'IFz2v+mSfzoYHkBEjAZwuzd2MCXJpjSz3jdaMSeNINQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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