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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743dc09b5c8d27f7d0194528f58cba48cfe5a8c0efbc2c88a9b7cbd7b4492cd3' 
  AND token = 'soFfwH/gLMD6XjhNoAUvDrrGUJbDf2sADAWYl4De12Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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