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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9bc81ddfe85c04886bdac59bd4ddfbc4050535a980abe0883a1af288493bec' 
  AND token = 'IfFO73SpMNuJK5iqygzeKdh3COpHZbQedrB8ULqDHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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