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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9071e56d95317e4e3bbf2bc0df4423f7ca124452b8bc4c37c9e1b664e9b0474' 
  AND token = 'qxkaVZt4KlTO5DqwMyQDd49Bvuv4lKrqqcobsdUtXJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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