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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68ff2a4d21e27897eb8cb4511655e4e741597a43959a7f68fabe80ba98305cd' 
  AND token = 'VTr1xnZBuSkaJaq2TbXs899rpGoPtReqTIU/C2CZ98A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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