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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033486952afa43b429930c2e7aff9fa725536ea1d023a8355e3c257c0cc35ecb' 
  AND token = 'HUPOeSdLKxf0LCgdWBqorLqal/2fofygrnQ/lgxE150=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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