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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288d8a7ec4e76e23f7c1eb356ea6a6713f3f8145ed7fe8851d653aad5dddeed2' 
  AND token = 'TZZ2mjhf1xqI9fpOaNCCGWmxfnFmXsqZfe3V4cQp7JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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