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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b617fcf72211a5f17d59e9a48f5abf38b1a28b47f5ff02e531d6911dca2733a5' 
  AND token = 'WT/QQYWBhkMK9nPPFpyb42RO5Puv3N16SEVmIdNomDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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