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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65df83fc0d15740e36ae55f356b9934fd96bf1ef0512990112e9cc2eb1744831' 
  AND token = 'Y36koYvlqE2cdS0RGSWysTQIBEseZk1lbiA03/J3tB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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