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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5c2e97cfefa63545db456020053797220e2d7a7ca7d6fc24cd8884e19ad5c7' 
  AND token = 't/S9n6lAV6f9lwWCUsWkpikUgHqxwzE8p1lqmVTDKgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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