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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde2b490bf97e946514327f362da79b0ac53872784f5f5c8a9ec20015316401a' 
  AND token = 'H5RZBJ60qCfUKaCmAO5+0ms3doFBDgBBzlo9Qx2A55M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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