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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5814aecf6cf9e10f363256968a836ad3df726d2f459ff471718c183d45df521' 
  AND token = 'UwdsLO4IEZ6B8k6m4Wyd0NV9sohI4/uVNLrqCWZ7IrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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