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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd767d7d7f32f8f8a76ff749eb5b46b616024f7a620f67936838c186c40db83dd' 
  AND token = '15C2VLCxoAKx2b4OXvWqY0FHNqMvDdiaUPSa4XRKGJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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