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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d74dea62737525adb7599d06721196c38e0f8864aea57b86d9bb52105dbb7e3' 
  AND token = '/L07qQVfFrWmVLnp6TgHljaSWDgM15TWaKLUvkaj5dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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