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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bbe9080b4c3bbbf57798b9f57f76fe9cce05b2c2bd41b1af531acb86bd84ae' 
  AND token = 'uynCYfQZlikhFEIw9v8juKUrl8kvYsRuNQj/UKKgpf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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