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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a034e6f73ccb63b45f1674885d4eec6a462e39d1dacf50c9eda65a4cf25f6103' 
  AND token = 'v4u07NpszObPmflns/7rwecgnaXqp/dKru2X8pYaD9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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