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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5237de89f7c029e94e72428d2a599efb4dc2252ff2e2e41e14bf4781106baa6f' 
  AND token = 'hHt2hF6QyoBq9Dao6TcXMlQYKDJd998Kw5h5fuVECwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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