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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb670b2928031dc55e67481f7bd9958374969b2ff802c5e4e789aecf385c99d' 
  AND token = 'Lu3scP/b90OyDJ5Ye8dIH4yS6xD7mI8glr63i6DfEsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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